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Full-water-soluble potassium-magnesium slow-release fertilizer production process

A water-soluble potassium and production process technology, which is applied to potash fertilizers, inorganic fertilizers, fertilization devices, etc., can solve the problems of large acid and alkali consumption, process energy consumption, high water consumption, and difficult to degrade, so as to improve soil nutrients and reduce Equipment investment, the effect of improving water solubility

Active Publication Date: 2019-12-20
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN108585960A discloses a method for preparing potassium magnesium fertilizer, which is obtained by mixed roasting polyhalite and potassium feldspar, leaching and evaporation crystallization, but since the structure of polyhalite and potassium feldspar is relatively stable, there is process energy consumption , high water consumption, and low fertilizer efficiency of the obtained product
[0006] CN107324849A discloses a method for preparing potassium magnesium sulfate fertilizer, which is to use langbeinite products to add water, hot melt, heat-preserve and filter, and the crystalline solid phase obtained by cooling the mother liquor is mixed and dried and granulated, thereby obtaining K 2 O≥35 wt% high-quality potassium magnesium sulfate fertilizer, this method improves the potassium grade of potassium magnesium fertilizer products, but does not improve the water solubility and fertilizer efficiency control effect of the product
[0007] CN109987995A discloses a mixed slow-release controlled-release chemical fertilizer and its preparation method. It utilizes the synergistic interaction between ordinary chemical fertilizers and slow-release chemical fertilizers or controlled-release chemical fertilizers. It is obtained by compounding and blending according to a certain proportion. The cost of slow and controlled release fertilizers is limited, and the price is high
[0008] CN110066191A discloses a novel slow-release compound fertilizer potassium magnesium phosphate production process, which uses magnesium oxide as a starting material, adopts acid-base neutralization reaction and double decomposition reaction to prepare potassium magnesium phosphate, but the method consumes a lot of acid and alkali, and the reaction The progress is difficult to control, and it is not suitable for the upgrading and transformation of existing potassium and magnesium fertilizer production enterprises
[0009] Traditional slow-release materials are mostly used for nitrogen fertilizers, microbial fertilizers and compound fertilizers, and are difficult to degrade. Long-term application will also affect the physical and chemical properties of the soil. At present, there is no public technology for the production of potassium and magnesium slow-release fertilizers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment adopts the semi-finished potassium and magnesium fertilizer produced by a production enterprise in Xinjiang, my country as raw material, and its main chemical composition includes: K + 18.59 wt%, Mg 2+ 5.90 wt%, SO 4 2- 47.58 wt%, water insoluble content 2.7 wt%.

[0030] (1) Mix the semi-finished products of potassium and magnesium fertilizer, fresh water, and crystallization mother liquid C to obtain a mixture. The chemical composition of the mixture includes K + 6.88 wt%, Mg 2+ 3.15 wt%, SO 4 2- 16.56 wt%, after heat-dissolving at 95°C for 90 minutes, solid-liquid separation to obtain a clear high-temperature mother liquor;

[0031] Wherein, the chemical composition of described crystalline mother liquor C comprises: K + 6.25wt%, Mg 2+ 2.96wt%, SO 4 2- 14.86wt%, H 2 O72.29 wt%;

[0032] (2) Cool the clarified high-temperature mother liquor to 40°C under vacuum, precipitate crystals, settle and concentrate, separate the supernatant liqui...

Embodiment 2

[0039] This embodiment adopts the semi-finished potassium and magnesium fertilizer produced by a production enterprise in Xitai, Qinghai, my country as raw material, and its main chemical composition includes: K + 19.02wt%, Mg 2+ 5.92wt%, SO 4 2- 47.2wt%, water insoluble content 2.0wt%.

[0040] (1) Mix the semi-finished products of potassium and magnesium fertilizer, fresh water, and crystallization mother liquid C to obtain a mixture. The chemical composition of the mixture includes K + 7.48 wt%, Mg 2+ 3.17 wt%, SO 4 2- 18.19 wt%, after thermal dissolution at 100°C for 60 minutes, solid-liquid separation to obtain a clear high-temperature mother liquor;

[0041] Wherein, the chemical composition of described crystalline mother liquor C comprises: K + 6.88wt%, Mg 2+ 3.15wt%, SO 4 2- 16.56wt%, H 2 O69.84wt%;

[0042] (2) Cool the clarified high-temperature mother liquor to 50°C under vacuum, precipitate crystals, settle and concentrate, separate the supernatant l...

Embodiment 3

[0049] This embodiment adopts the semi-finished potassium and magnesium fertilizer produced by a production enterprise in Dongtai, Qinghai, my country as raw material, and its main chemical composition includes: K + 18.85wt%, Mg 2+ 5.91wt%, SO 4 2- 47.29wt%, water insoluble content 2.5wt%.

[0050] (1) Mix the semi-finished products of potassium and magnesium fertilizers, fresh water, and crystallization mother liquor C to obtain a mixture. The chemical composition of the mixture includes: K + 7.07 wt%, Mg 2+ 3.09 wt%, SO 4 2- 17.30 wt%, after heat-dissolving at 90°C for 80 minutes, solid-liquid separation to obtain a clear high-temperature mother liquor;

[0051] Wherein, the chemical composition of described crystalline mother liquor C comprises: K + 6.23wt%, Mg 2+ 3.13wt%, SO 4 2- 15.22wt%, H 2 O71.39wt%;

[0052] (2) Cool the clarified high-temperature mother liquor to 60°C under vacuum, precipitate crystals, settle and concentrate, separate the supernatant li...

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PUM

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Abstract

The invention relates to a full-water-soluble potassium-magnesium slow-release fertilizer production process, which comprises: preparing a potassium-magnesium fertilizer semi-finished product, fresh water and a crystallization mother liquor C; carrying out hot melting, and carrying out solid-liquid separation to obtain a high-temperature mother liquor; carrying out vacuum cooling, crystallizing, and concentrating to obtain a slurry; adding water into the slurry, carrying out high-temperature conversion, carrying out thermal insulation, and filtering to obtain potassium-magnesium fertilizer particles; preparing a coating liquid by using chitosan, polyvinyl alcohol, talc powder and water as raw materials; and pre-heating the obtained potassium-magnesium fertilizer particles, and coating withthe obtained coating liquid to obtain the potassium-magnesium fertilizer. According to the invention, with the process, the required equipment investment is greatly reduced, and part of equipment isproperly modified on the basis of the original production equipment; the full-water-soluble potassium-magnesium slow-release fertilizer produced by the process has a K2O content of greater than or equal to 35 wt % and a water-insoluble substance content of less than or equal to 0.2 wt%; the coating has characteristics of good adhesion with potassium-magnesium fertilizers, high wrapping property, low cost and biodegradability; and the obtained product has good slow release performance, and can improve the nutrients in soil, the yield and the effect in crop growth.

Description

technical field [0001] The invention relates to a production process of a potassium-magnesium slow-release fertilizer, in particular to a production process of a water-soluble potassium-magnesium slow-release fertilizer. Background technique [0002] Compared with the traditional potassium sulfate, potassium magnesium sulfate fertilizer increases the magnesium element, which can provide more comprehensive and balanced nutrients for plants, and is more suitable for the application of economic crops such as vegetables, fruit trees, tobacco, tea and flowers. However, my country is a country that lacks solid potassium salt mines. Most of the preparation of potassium and magnesium sulfate fertilizers is made by drying brine in salt fields, flotation and processing after mechanical harvesting, and the obtained products generally have poor water solubility and low effective utilization rate of fertilizers. defect. [0003] With the continuous development of my country's agriculture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05D1/00C05G3/00
Inventor 高文远梁晓玲蒋世鹏谢超冯文平娄金东罗稳刘雨星邹娟杨三妹杨清
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN